condition mean min max ZT0-3 1.4152200000000001 1.4152200000000001 1.4152200000000001 ZT4-7 0.8129615 0.8129615 0.8129615 ZT8-11 1.694925 1.694925 1.694925 ZT12-15 1.35995 1.35995 1.35995 ZT16-19 4.476649999999999 4.476649999999999 4.476649999999999 ZT20-23 2.84 2.84 2.84